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I agree it is not a big deal to install a Curt hitch. I went with the aftermarket harness and it didn't work although stated it would. To do again I would go with the factory harness and not go through the headache of the aftermarket part.

the factory one clicked in to the harness came with the grommet, then has the module that plugs in right in front of the batter
Although i did not install that..
It was so hot yesterday.. and we had contractors at work so i was out side All day long.. I was just so kicked.. I just wanted to get it on and then take a shower..
only thing is that the curt doesnt have the holder for the big plug.. So ill end up making something and welding it on to the hitch to hold the connecter..